I have a 2000 MXZ 600 with 1500 miles and this is the second blown motor. Seems like I get about 700 miles per engine, completely stock sled. Anyway my question is, I split the crankcase to change seals. I found inner PTO bearing felt a little rough (which was new last rebuild, so I thought) and ordered 2 PTO bearings.(In fear I would f-up the outer pulling it to get to the inner) Noticed the the outer bearing is sealed on both sides and is packed in grease, what kind of grease shoud I pack the new bearing with? And does anyone know how to tell the thickness of the base gasket by the holes in the center?